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Underdrive Pulleys

Old 03-28-2007, 11:29 PM
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Join Date: Feb 2007
Posts: 10
Default Underdrive Pulleys

Just wanted to know if underdrive pulleys made an improvement on HP and how hard they are to install.
Old 03-29-2007, 12:10 PM
droopy128's Avatar
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Join Date: Jan 2007
Location: Bayarea, CA
Posts: 627
Default RE: Underdrive Pulleys

Are you referring to the Crank pulley? Pepz change their pulley for a lighter one.. from few pounds to few ounce, won’t increase your hp, but would ease on motor rotation so its’ respond a little better. If this is what u looking for, get a lighten fly wheel too, just something to start with. Installation is not that hard.. but would def. need some power tool to remove the crank bolt.
Old 03-29-2007, 12:14 PM
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Join Date: Jul 2006
Posts: 478
Default RE: Underdrive Pulleys

Well, Is this your only way to make power at this point? If not, id sink money into something else.
Old 03-30-2007, 12:29 AM
Join Date: May 2006
Posts: 976
Default RE: Underdrive Pulleys

emmmm...i have heard a couple rumors not to combine lightened flywheel with underdrive crank pulley. Cant remember reason. Anyone else heard this, know reason?
Old 03-30-2007, 10:35 AM
StifflersMom's Avatar
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Join Date: Nov 1978
Location: The Moon
Posts: 6,804
Default RE: Underdrive Pulleys

balance of the rotating assy gets thrown off...if you have a harmonic balancer crank pulley - leave it alone.
Old 03-30-2007, 12:18 PM
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Join Date: Jan 2005
Location: Loveland CO
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Default RE: Underdrive Pulleys

ok im gonna lay it down for you. I just got ride of my megan racing crank pulley. I had to use a 5 foot breaker bar with a chain wrench to get the bolt out. i didnt feel one bit of a difference in reving or power. DONT WASTE YOUR MONEY
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